Few lived the rock 'n' roll lifestyle quite as vigorously as Motörhead chieftain Lemmy Kilmister, so his presence on a song was the equivalent of the heavy metal seal of approval. The mutton-chopped frontman lent his unmistakable whiskey-and-leather voice to countless tracks since the '60s, from his brief stint with prog warriors Hawkwind to punk and metal cuts by the Ramones, Slash and Ozzy.